• Manley STD Stroke 99.5mm Bore 9.8:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (612100C-4)
  • Manley STD Stroke 99.5mm Bore 9.8:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (612100C-4)
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Manley STD Stroke 99.5mm Bore 9.8:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (612100C-4)

Manley STD Stroke 99.5mm Bore 9.8:1 Dish Piston Set with Rings | Subaru WRX STi (04+) (612100C-4)

612100C-4

In stock

$699.23 USD
$760.03 USD $699.23 USD
ADDITIONAL DISCOUNTS APPLIED AT CHECKOUT Sold out

The Manley Platinum Series pistons are high-performance forged components designed specifically for the Subaru WRX STI with the EJ257 engine. Crafted from 2618 alloy, these pistons offer exceptional strength and durability for demanding applications. They feature proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select part numbers, ensuring reliable performance under high-stress conditions. These pistons are engineered to provide optimal combustion efficiency and power output, making them ideal for both stock and upgraded engine builds. Their construction emphasizes longevity and consistent performance, whether used in daily driving, tuning, or racing environments.

Designed to fit 2011–2025 Subaru WRX STI models equipped with the EJ257 engine, these pistons serve as a direct replacement for stock components. They are suitable for performance upgrades, rebuilds, or custom engine builds aiming for increased power and reliability. The set includes pistons and rings, ready for installation in a standard bore (99.5mm) with a stock stroke. These pistons are best suited for high-performance street and track use, providing a robust foundation for tuning and power enhancement. Proper installation and compatibility with other engine components are recommended for optimal results.

Overview

Manley Performance Pistons

Fitment Summary

Part #: 612100C-4

Overview

The Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set is a high-performance engine component designed for serious tuners and engine builders seeking durability and precision. Crafted from premium 2618 alloy forgings, these pistons are engineered to withstand the rigors of high-performance applications while maintaining excellent thermal stability. Ideal for those looking to enhance their Subaru WRX STi's engine response, reliability, and overall power potential, this piston set offers a reliable foundation for custom builds and upgrades. Whether you're rebuilding your engine or optimizing for increased horsepower, these pistons provide a perfect balance of strength and efficiency. Their dish design supports proper compression ratios, making them suitable for a variety of tuning setups. Built with professional-grade materials and manufacturing standards, they help ensure your engine maintains peak performance over the long haul.

Key Features

Designed with performance in mind, these pistons feature:
  • 2618 alloy forgings for superior strength and thermal resistance
  • Proven cam and barrel skirt profiles for optimal fit and durability
  • Tool steel wrist pins for enhanced wear resistance
  • Moly skirt coatings on select part numbers to reduce friction and improve longevity
  • Standard bore and stroke dimensions for straightforward installation
  • Dish piston design to support specific compression ratios
  • Precision-machined for consistent quality and fit

Construction & Design

These pistons are manufactured from high-grade 2618 aluminum alloy, known for its excellent strength-to-weight ratio and thermal properties. The moly skirt coatings help reduce friction and wear, contributing to engine longevity. The design incorporates proven profiles that optimize piston stability and response under high-stress conditions, making them suitable for both stock rebuilds and performance tuning.

Performance & Response

Engineered to support high-performance applications, these pistons help improve engine response and durability. Their robust construction ensures reliable operation during aggressive driving or tuning scenarios, providing a solid foundation for increased power output and consistent performance.

Installation & Fitment

Designed to fit Subaru WRX STi models from 2004 and newer with EJ257 engines, these pistons are a direct replacement for OEM components. Proper installation requires standard engine rebuilding procedures, and compatibility should be confirmed with your specific vehicle configuration.

What’s Included

The package includes a complete set of pistons with rings, designed to match the specifications of your engine rebuild or upgrade project. Hardware and additional components are not included and should be sourced separately if needed.

Ideal For

Perfect for professional engine builders, tuners, and enthusiasts aiming to maximize their Subaru WRX STi’s engine performance, durability, and response through high-quality, reliable piston components.
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